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>> Development Director 11 “ Tenants, even if they say, ‘ that ’ s where we want the lift opening, that ’ s where we want the cores or whatever in our unit ’, you can guarantee they ’ ll change their mind. You can absolutely guarantee it ” Scalable Change CostsAverage Cost Non scalable change£ 35,000 Horizontal size change£ 60,000 Size change with vertical infills£ 80,000 Size change with new vertical penetrations£ 160,000